One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,13)(12,14)(15,16)(17,18)(19,23)(20,26)(21,31)(22,27)(24,30)(25,28)(29,32) involution — undirected(2,6)(7,8)(9,11)(10,13)(12,15)(14,16)(17,19)(18,23)(20,28)(21,30)(22,29)(24,31)(25,26)(27,32) involution — undirected(1,3,5,4)(2,7,6,8)(10,14)(11,15)(17,20,22,30)(18,24,27,26)(19,21,29,28)(23,25,32,31)(1,4,5,3)(2,8,6,7)(10,14)(13,16)(17,21,30,19,22,28,20,29)(18,25,24,32,27,31,26,23)(2,6)(7,8)(17,20,22,30)(18,26,27,24)(19,28,29,21)(23,25,32,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.